_______ for the dog. You’d better __________ it.

A．Look out; get away with

B．Watch out; get away from

C．Block out; get close to

D．Be careful; get out of

供给定理存在的原因是（）

A.技术进步

B.企业对最大利润的追求

C.价格须同成本相适应

D.消费者的偏好

E.以上都对